Document Detail

Comparison of growth limits of Listeria monocytogenes in milk, broth and cheese.
MedLine Citation:
PMID:  20649836     Owner:  NLM     Status:  In-Process    
AIM: To determine growth initiation differences of Listeria monocytogenes between a cheesemaking context, milk and tryptic soy broth (TSB).
METHODS AND RESULTS: A laboratory-scale cheese was made with a mix of two strains of L. monocytogenes at four initial pH values, five water activity (a(w)) values and two contamination levels at 30°C. Counts of L. monocytogenes were determined at time 0 and after 8h of cheese manufacture. Milk and TSB at the same pH and a(w) conditions were inoculated with the L. monocytogenes mix in multi-well plates. Growth was determined by plating each well onto Agosti & Ottaviani Listeria Agar after 8h of incubation at 30°C. Each condition was repeated six times, and growth initiation probability was modelled with logistic regression models. Growth initiation boundaries were obtained for each matrix type. The results showed that the growth limits were matrix dependent. In the three matrix types, a(w) was the most important factor affecting the probability of growth initiation. Contamination level affected growth TSB and cheesemaking conditions.
CONCLUSIONS: The interface wideness and position in cheese, milk and TSB were dissimilar, indicating that the use of models evaluated in TSB or milk could not be used to predict the behaviour of L. monocytogenes under cheesemaking conditions.
SIGNIFICANCE AND IMPACT OF THE STUDY: Predictive models generated in liquid media are not necessarily adaptable to solid food, and the generation of real food models is necessary.
M S Schvartzman; X Belessi; F Butler; P Skandamis; K Jordan
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-23
Journal Detail:
Title:  Journal of applied microbiology     Volume:  109     ISSN:  1365-2672     ISO Abbreviation:  J. Appl. Microbiol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9706280     Medline TA:  J Appl Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  1790-9     Citation Subset:  IM    
Copyright Information:
© 2010 The Authors. Journal of Applied Microbiology © 2010 The Society for Applied Microbiology.
Food Research Centre Moorepark, Teagasc, Fermoy, Co. Cork, Ireland.
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